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It is exothermic Cuz delta H Is -ve
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Combustion reactions are almost always exothermic as they liberate heat , i.e. ΔG = negative.
So the reaction,
S + O2 --------> SO2  is a combustion reaction and so exothermic. 
It is also an oxidation reaction, as oxidation number of sulfur increased here ( 0 to +2).
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